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                                <div id="anchor-navigation-ex-navbar"><i class="fa fa-navicon"></i><ul><ul><li><span class="title-icon "></span><a href="#&#x5B57;&#x7B26;&#x4E32;"><b></b>&#x5B57;&#x7B26;&#x4E32;</a></li><ul><li><span class="title-icon "></span><a href="#&#x5728;&#x5B57;&#x7B26;&#x4E32;&#x4E2D;&#x641C;&#x7D22;"><b></b>&#x5728;&#x5B57;&#x7B26;&#x4E32;&#x4E2D;&#x641C;&#x7D22;</a></li><li><span class="title-icon "></span><a href="#&#x4ECE;&#x5B57;&#x7B26;&#x4E32;&#x4E2D;&#x63D0;&#x53D6;"><b></b>&#x4ECE;&#x5B57;&#x7B26;&#x4E32;&#x4E2D;&#x63D0;&#x53D6;</a></li><li><span class="title-icon "></span><a href="#&#x8F6C;&#x6362;&#x5927;&#x5C0F;&#x5199;"><b></b>&#x8F6C;&#x6362;&#x5927;&#x5C0F;&#x5199;</a></li><li><span class="title-icon "></span><a href="#&#x53BB;&#x9664;&#x7A7A;&#x5B57;&#x7B26;"><b></b>&#x53BB;&#x9664;&#x7A7A;&#x5B57;&#x7B26;</a></li><li><span class="title-icon "></span><a href="#&#x6784;&#x5EFA;&#x53EF;&#x53D8;&#x5B57;&#x7B26;&#x4E32;"><b></b>&#x6784;&#x5EFA;&#x53EF;&#x53D8;&#x5B57;&#x7B26;&#x4E32;</a></li><li><span class="title-icon "></span><a href="#&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;"><b></b>&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;</a></li></ul></ul></ul></div><a href="#" id="anchorNavigationExGoTop"><i class="fa fa-arrow-up"></i></a><!-- ex_nolevel -->
<h2 id="&#x5B57;&#x7B26;&#x4E32;"><a name="&#x5B57;&#x7B26;&#x4E32;" class="anchor-navigation-ex-anchor" href="#&#x5B57;&#x7B26;&#x4E32;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x5B57;&#x7B26;&#x4E32;</h2>
<p>Dart&#x4E2D;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x662F;UTF-16&#x4EE3;&#x7801;&#x5355;&#x5143;&#x7684;&#x4E0D;&#x53EF;&#x53D8;&#x5E8F;&#x5217;&#x3002;</p>
<h3 id="&#x5728;&#x5B57;&#x7B26;&#x4E32;&#x4E2D;&#x641C;&#x7D22;"><a name="&#x5728;&#x5B57;&#x7B26;&#x4E32;&#x4E2D;&#x641C;&#x7D22;" class="anchor-navigation-ex-anchor" href="#&#x5728;&#x5B57;&#x7B26;&#x4E32;&#x4E2D;&#x641C;&#x7D22;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x5728;&#x5B57;&#x7B26;&#x4E32;&#x4E2D;&#x641C;&#x7D22;</h3>
<pre><code class="lang-dart"><span class="hljs-built_in">print</span>(<span class="hljs-string">&apos;Never odd or even&apos;</span>.contains(<span class="hljs-string">&apos;odd&apos;</span>));
<span class="hljs-built_in">print</span>(<span class="hljs-string">&apos;Never odd or even&apos;</span>.startsWith(<span class="hljs-string">&apos;Never&apos;</span>)); <span class="hljs-built_in">print</span>(<span class="hljs-string">&apos;Never odd or even&apos;</span>.endsWith(<span class="hljs-string">&apos;even&apos;</span>));
<span class="hljs-built_in">print</span>(<span class="hljs-string">&apos;Never odd or even&apos;</span>.indexOf(<span class="hljs-string">&apos;odd&apos;</span>) == <span class="hljs-number">6</span>);
</code></pre>
<h3 id="&#x4ECE;&#x5B57;&#x7B26;&#x4E32;&#x4E2D;&#x63D0;&#x53D6;"><a name="&#x4ECE;&#x5B57;&#x7B26;&#x4E32;&#x4E2D;&#x63D0;&#x53D6;" class="anchor-navigation-ex-anchor" href="#&#x4ECE;&#x5B57;&#x7B26;&#x4E32;&#x4E2D;&#x63D0;&#x53D6;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x4ECE;&#x5B57;&#x7B26;&#x4E32;&#x4E2D;&#x63D0;&#x53D6;</h3>
<pre><code class="lang-dart"><span class="hljs-comment">// &#x622A;&#x53D6;&#x5B50;&#x4E32;</span>
<span class="hljs-keyword">assert</span>(<span class="hljs-string">&apos;Never odd or even&apos;</span>.substring(<span class="hljs-number">6</span>, <span class="hljs-number">9</span>) == <span class="hljs-string">&apos;odd&apos;</span>);

<span class="hljs-comment">// &#x5B57;&#x7B26;&#x4E32;&#x5206;&#x5272;.</span>
<span class="hljs-keyword">var</span> parts = <span class="hljs-string">&apos;structured web apps&apos;</span>.split(<span class="hljs-string">&apos; &apos;</span>);
<span class="hljs-keyword">assert</span>(parts.length == <span class="hljs-number">3</span>);
<span class="hljs-keyword">assert</span>(parts[<span class="hljs-number">0</span>] == <span class="hljs-string">&apos;structured&apos;</span>);

<span class="hljs-comment">// &#x901A;&#x8FC7;&#x7D22;&#x5F15;&#x83B7;&#x53D6;&#x5355;&#x4E2A;&#x5B57;&#x7B26;</span>
<span class="hljs-keyword">assert</span>(<span class="hljs-string">&apos;Never odd or even&apos;</span>[<span class="hljs-number">0</span>] == <span class="hljs-string">&apos;N&apos;</span>);

<span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> char <span class="hljs-keyword">in</span> <span class="hljs-string">&apos;hello&apos;</span>.split(<span class="hljs-string">&apos;&apos;</span>)) {
  <span class="hljs-built_in">print</span>(char);
}

<span class="hljs-comment">// &#x5B57;&#x7B26;&#x4E32;&#x66FF;&#x6362;</span>
<span class="hljs-built_in">print</span>(<span class="hljs-string">&quot;obj ec t&quot;</span>.replaceAll(<span class="hljs-string">&quot; &quot;</span>, <span class="hljs-string">&quot;&quot;</span>));
<span class="hljs-built_in">print</span>(<span class="hljs-string">&quot;obj ec t&quot;</span>.replaceFirst(<span class="hljs-string">&quot; &quot;</span>, <span class="hljs-string">&quot;&quot;</span>));
<span class="hljs-built_in">print</span>(<span class="hljs-string">&quot;obj ec t&quot;</span>.replaceRange(<span class="hljs-number">0</span>, <span class="hljs-number">4</span>,<span class="hljs-string">&quot;p&quot;</span>));

<span class="hljs-comment">// &#x83B7;&#x53D6;&#x5B57;&#x7B26;&#x4E32;&#x4E2D;&#x7684;&#x6240;&#x6709;UTF-16 code units</span>
<span class="hljs-keyword">var</span> codeUnitList =
    <span class="hljs-string">&apos;Never odd or even&apos;</span>.codeUnits.toList();
<span class="hljs-keyword">assert</span>(codeUnitList[<span class="hljs-number">0</span>] == <span class="hljs-number">78</span>);
</code></pre>
<h3 id="&#x8F6C;&#x6362;&#x5927;&#x5C0F;&#x5199;"><a name="&#x8F6C;&#x6362;&#x5927;&#x5C0F;&#x5199;" class="anchor-navigation-ex-anchor" href="#&#x8F6C;&#x6362;&#x5927;&#x5C0F;&#x5199;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x8F6C;&#x6362;&#x5927;&#x5C0F;&#x5199;</h3>
<pre><code class="lang-dart"><span class="hljs-comment">// &#x8F6C;&#x6362;&#x4E3A;&#x5927;&#x5199;</span>
<span class="hljs-keyword">assert</span>(<span class="hljs-string">&apos;structured web apps&apos;</span>.toUpperCase() ==
    <span class="hljs-string">&apos;STRUCTURED WEB APPS&apos;</span>);

<span class="hljs-comment">// &#x8F6C;&#x6362;&#x4E3A;&#x5C0F;&#x5199;</span>
<span class="hljs-keyword">assert</span>(<span class="hljs-string">&apos;STRUCTURED WEB APPS&apos;</span>.toLowerCase() ==
    <span class="hljs-string">&apos;structured web apps&apos;</span>);
</code></pre>
<h3 id="&#x53BB;&#x9664;&#x7A7A;&#x5B57;&#x7B26;"><a name="&#x53BB;&#x9664;&#x7A7A;&#x5B57;&#x7B26;" class="anchor-navigation-ex-anchor" href="#&#x53BB;&#x9664;&#x7A7A;&#x5B57;&#x7B26;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x53BB;&#x9664;&#x7A7A;&#x5B57;&#x7B26;</h3>
<pre><code class="lang-dart"><span class="hljs-comment">// &#x53BB;&#x9664;&#x4E24;&#x8FB9;&#x7A7A;&#x683C;</span>
<span class="hljs-keyword">assert</span>(<span class="hljs-string">&apos;  hello  &apos;</span>.trim() == <span class="hljs-string">&apos;hello&apos;</span>);

<span class="hljs-comment">// &#x68C0;&#x67E5;&#x5B57;&#x7B26;&#x4E32;&#x662F;&#x5426;&#x4E3A;&#x7A7A;</span>
<span class="hljs-keyword">assert</span>(<span class="hljs-string">&apos;&apos;</span>.isEmpty);

<span class="hljs-comment">// &#x68C0;&#x67E5;&#x5B57;&#x7B26;&#x4E32;&#x662F;&#x5426;&#x975E;&#x7A7A;</span>
<span class="hljs-keyword">assert</span>(<span class="hljs-string">&apos;  &apos;</span>.isNotEmpty);
</code></pre>
<h3 id="&#x6784;&#x5EFA;&#x53EF;&#x53D8;&#x5B57;&#x7B26;&#x4E32;"><a name="&#x6784;&#x5EFA;&#x53EF;&#x53D8;&#x5B57;&#x7B26;&#x4E32;" class="anchor-navigation-ex-anchor" href="#&#x6784;&#x5EFA;&#x53EF;&#x53D8;&#x5B57;&#x7B26;&#x4E32;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x6784;&#x5EFA;&#x53EF;&#x53D8;&#x5B57;&#x7B26;&#x4E32;</h3>
<p>&#x4E0E;Java&#x7C7B;&#x4F3C;&#xFF0C;&#x5728;&#x8C03;&#x7528;<code>toString()</code>&#x4E4B;&#x524D;&#xFF0C;<code>StringBuffer</code>&#x4E0D;&#x4F1A;&#x751F;&#x6210;&#x771F;&#x6B63;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x5BF9;&#x8C61;</p>
<pre><code class="lang-dart"><span class="hljs-comment">// writeAll()&#x65B9;&#x6CD5;&#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;&#x662F;&#x53EF;&#x9009;&#x7684;&#xFF0C;&#x7528;&#x4E8E;&#x6307;&#x5B9A;&#x5206;&#x9694;&#x7B26;</span>
<span class="hljs-keyword">var</span> sb = <span class="hljs-built_in">StringBuffer</span>();
sb..write(<span class="hljs-string">&apos;Use a StringBuffer for &apos;</span>)
  ..writeAll([<span class="hljs-string">&apos;efficient&apos;</span>, <span class="hljs-string">&apos;string&apos;</span>, <span class="hljs-string">&apos;creation&apos;</span>], <span class="hljs-string">&apos; &apos;</span>)
  ..write(<span class="hljs-string">&apos;.&apos;</span>);

<span class="hljs-keyword">var</span> fullString = sb.toString();

<span class="hljs-keyword">assert</span>(fullString == <span class="hljs-string">&apos;Use a StringBuffer for efficient string creation.&apos;</span>);

<span class="hljs-built_in">StringBuffer</span> sBuff = <span class="hljs-built_in">StringBuffer</span>();
sBuff.write(<span class="hljs-string">&quot;hello&quot;</span>);
sBuff.writeln(<span class="hljs-string">&quot;--&quot;</span>);
sBuff.write(<span class="hljs-string">&quot;world&quot;</span>);
sBuff.clear();
<span class="hljs-built_in">print</span>(sBuff.toString());
</code></pre>
<h3 id="&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;"><a name="&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;" class="anchor-navigation-ex-anchor" href="#&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;</h3>
<p><a href="https://www.jb51.net/tools/regexsc.htm" target="_blank">&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x7B26;&#x53F7;&#x8868;</a></p>
<p>RegExp&#x7C7B;&#x63D0;&#x4F9B;&#x4E86;&#x4E0E;JavaScript&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x76F8;&#x540C;&#x7684;&#x529F;&#x80FD;&#x3002;&#x4F7F;&#x7528;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x8FDB;&#x884C;&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x9AD8;&#x6548;&#x641C;&#x7D22;&#x548C;&#x6A21;&#x5F0F;&#x5339;&#x914D;&#x3002;</p>
<pre><code class="lang-dart"><span class="hljs-comment">// &#x4E00;&#x4E2A;&#x6216;&#x591A;&#x4E2A;&#x6570;&#x5B57;&#x7684;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;</span>
<span class="hljs-keyword">var</span> numbers = <span class="hljs-built_in">RegExp</span>(<span class="hljs-string">r&apos;\d+&apos;</span>);

<span class="hljs-keyword">var</span> allCharacters = <span class="hljs-string">&apos;llamas live fifteen to twenty years&apos;</span>;
<span class="hljs-keyword">var</span> someDigits = <span class="hljs-string">&apos;llamas live 15 to 20 years&apos;</span>;

<span class="hljs-comment">// contains() &#x53EF;&#x4F7F;&#x7528;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;</span>
<span class="hljs-keyword">assert</span>(!allCharacters.contains(numbers));
<span class="hljs-keyword">assert</span>(someDigits.contains(numbers));

<span class="hljs-comment">// &#x5C06;&#x6BCF;&#x4E2A;&#x5339;&#x914D;&#x9879;&#x66FF;&#x6362;&#x4E3A;&#x53E6;&#x4E00;&#x4E2A;&#x6307;&#x5B9A;&#x5B57;&#x7B26;&#x4E32;&#x3002;</span>
<span class="hljs-keyword">var</span> exedOut = someDigits.replaceAll(numbers, <span class="hljs-string">&apos;XX&apos;</span>);
<span class="hljs-keyword">assert</span>(exedOut == <span class="hljs-string">&apos;llamas live XX to XX years&apos;</span>);
</code></pre>
<p>&#x8FD8;&#x53EF;&#x4EE5;&#x76F4;&#x63A5;&#x4F7F;&#x7528;RegExp&#x7C7B;&#xFF0C;Match&#x7C7B;&#x63D0;&#x4F9B;&#x5BF9;&#x6B63;&#x5219;&#x8868;&#x8FBE;&#x5F0F;&#x5339;&#x914D;&#x7684;&#x8BBF;&#x95EE;&#x3002;</p>
<pre><code class="lang-dart"><span class="hljs-keyword">var</span> numbers = <span class="hljs-built_in">RegExp</span>(<span class="hljs-string">r&apos;\d+&apos;</span>);
<span class="hljs-keyword">var</span> someDigits = <span class="hljs-string">&apos;llamas live 15 to 20 years&apos;</span>;

<span class="hljs-comment">// &#x68C0;&#x67E5;&#x662F;&#x5426;&#x5728;&#x5B57;&#x7B26;&#x4E32;&#x4E2D;&#x5339;&#x914D;</span>
<span class="hljs-keyword">assert</span>(numbers.hasMatch(someDigits));

<span class="hljs-comment">// &#x5FAA;&#x73AF;&#x904D;&#x5386;&#x6240;&#x6709;&#x5339;&#x914D;&#x9879;</span>
<span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> match <span class="hljs-keyword">in</span> numbers.allMatches(someDigits)) {
  <span class="hljs-built_in">print</span>(match.group(<span class="hljs-number">0</span>)); <span class="hljs-comment">// 15&#x3001;20</span>
}
</code></pre>
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